code: def __init__(self):
      ma1, ma2 = self.p.ma(period=self.p.p1), self.p.ma(
          period=self.p.p2
      )
      self.cross = bt.ind.CrossOver(ma1, ma2)
  
      self.orefs = list()
  
      if self.p.usebracket:
          print("-" * 5, "Using buy_bracket")
  
file_path: backtrader/samples/bracket/bracket.py
imports: from __future__ import absolute_import, division, print_function, unicode_literals
  import argparse
  import datetime
  import backtrader
label_desc: Use image node_id 2 to create a new St object from inherited base classes: bt with example: obj = St()